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create-an-ssh-key.step

message "An SSH key uniquely identifies you (and your computer) when your computer is communicating with other computers. Think of an SSH key as a fancy password."

message "You'll need one of these to create your Github account."

option "Do you have a preexisting SSH key for some other reason?" do
  message "Maybe you went to a previous RailsBridge workshop, or generated an SSH key to push some code to GitHub? You can check with the following command:"
  console "ls ~/.ssh/id_rsa"
  message "If you see the message **No such file or directory**, you don't have an SSH key yet."
  option_half "'No such file or directory'" do
    message "Go on to <a href='#generate-key'>Generate an SSH key"
  end
  option_half "'/Users/[something]/.ssh/id_rsa'" do
    link_without_toc 'create-a-webpage'
  end
end

a name: "generate-key"
option "Generate an SSH key" do
  important "Use the same email address for git, github, and ssh."

  important "**REPLACE** `student@example.com` with your **actual email address** below."

  console "ssh-keygen -C student@example.com -t rsa"

  message "Press enter to accept the default key save location."

  message "Next, you'll be asked for a passphrase."

  h1 "Choose whether to use a passphrase"
  blockquote do
    option_half "No passphrase" do
      message "Hit enter to accept blank passphrase, then hit enter again."
    end
    option_half "Passphrase" do
      message "If your computer is shared with other people, as in a work laptop, you should choose and enter a real passphrase. Twice."
    end
  end

  message "After key generation is complete, you'll have output that looks like this."

  result <<-OUTPUT
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/student/.ssh/id_rsa):
Created directory '/Users/student/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/student/.ssh/id_rsa.
Your public key has been saved in /Users/student/.ssh/id_rsa.pub.
The key fingerprint is:
88:54:ab:77:fe:5c:c3:7s:14:37:28:8c:1d:ef:2a:8d student@example.com
  OUTPUT

  verify do
    message "Your brand-new public key is now stored at `~/.ssh/id_rsa.pub`"
    tip "Public vs. Private Keys" do
      message "If you look inside `~/.ssh/`, you will notice two files with the same name: `id_rsa` and `id_rsa.pub`."
      message "`id_rsa.pub` is your **public key** and can be shared freely."
      message "`id_rsa` is your **private key** and must be kept secret."
      message "If someone else gets your private key and your passphrase, then they can pretend to be you and log on to your Heroku or Github accounts and cause mischief!"
    end
  end

  message "Add your generated key to the authentication agent using the following command:"

  console "ssh-add ~/.ssh/id_rsa"

  result <<-OUTPUT
Enter passphrase for /Users/student/.ssh/id_rsa:
Identity added: /Users/student/.ssh/id_rsa (/Users/student/.ssh/id_rsa)"
  OUTPUT

  tip "Could not open a connection to your authentication agent" do
    message "If the ssh-agent is not running, you will come across this error.  Here are a few commands that you can try to use to start the ssh-agent:"
    console_with_message "For some Windows machines:", "eval `ssh-agent -s`"
    console_with_message "For others (confirmed on some Windows 7, 8, 8.1, and 10 setups):", "eval $(ssh-agent)"
    console_with_message "For Linux:", "eval `ssh-agent`"
    message <<-MARKDOWN
    <p>For additional options, this StackOverflow thread has been helpful: <a href="    http://stackoverflow.com/questions/17846529/could-not-open-a-connection-to-your-authentication-agent">    http://stackoverflow.com/questions/17846529/could-not-open-a-connection-to-your-authentication-agent</a></p>
     MARKDOWN
  end
end

next_step 'create-a-webpage'